Spindle bearing



' L. GAMET SPINDLE-BEARING March 7, 1950 2 Sheets-Sheet 1 Filed June 18, 1945 March 7, 1950 L GAMET 2,499,640

SPINDLE-BEARING 2 Sheets-Sheet 2 Filed June 18. 1946 43am W Patented Mar. 7, 1950 SPINDLE BEARING Louis Garnet, Bouglval,

La Precision Industrielle,

France, asslgnor to Rueil-Malmaison,

France, a corporation of France Application J one In France is, 1946, Serial No. 677,595 December 19, 1945 6 Claims. (Cl. 30818'Z) This invention has for an object an improved bearing for machine tool applications, capable of withstanding high spindle speeds under considerable radial and thrust loads, having reduced internal wear and eliminating resonance vibrations which are present at high speeds in ordinary anti-friction bearings.

lhis improved bearing is based on the tapered roller principle. Conventional tapered roller bearings have relatively low speed limits under heavy leads due to friction of rollers on race ribs, which generates heat. This rapidly dilates the inner races whi. h are mounted in opposition. Being conical, dilatation of these races increases the thrust load on roller faces which finally causes general bearing breakdown. If equal dilatation of bearing inner and outer races and corresponding longitudinal dilatation of spindle on which hearing inner races are mountedcould be arranged, initial adjustment of hearing would be main tained, and correct iunctional conditions obtained at all speeds.

A lubricant introduced in the bearing would tend to regularize the temperature of bearing components and spindle. Anti-friction bearings however cannot function correctly at high speed when abundantly lubricated. Manufacturers recomrnend very scanty oil feeds or even oil mist lubrication when spindle speeds are particularly high, this being due to the fact that rolling components of anti-friction bearings (either ball or rollers) and the retainers or spacers thereof churn the oil energetically causing high temperature rise. In roller bearings, the crushing efiect of the rollers on oil causes even higher temperatures to be generated. It is therefore essential that oil supplied to anti-friction bearings be limited to the quantity strictly necessary for lubrication purposes, any surplus quantity introduced for the purpose of carrying away heat, having exactly the opposite effect.

The present invention has for its principal object a bearing arranged to allow ample introduction of lubricant, which by carrying away the heat'sgenerated by high loading conditions and byequalizing temperature rise of bearing components and spindle, increases considerably the speed limits at which bearing failure is experienced.

Designed primarily for machine-tool spindle applications the new bearing incorporates additional advantages such as the elimination of resonance vibrations and the increased service obtained because of the lubrication feed to the roller sliding friction surfaces.

With the above and other objectsin view which will become apparent from the detailed description below the invention is shown in the drawings in which:

Fig. l is a longitudinal sectional View of a hearing according to the invention.

Fig. 2 is an axial section of the roller retaining cage on lines HiI of Fig. 3.

Fig. 3 is a fragmentary view of said retainer as viewed in direction of arrow III-III of Fig. 2.

Fig. 4 is a partial section of said retainer on line IV-IV of Fig. 2.

In the drawings wherein like reference numerals indicate like parts the outer ring of the hearing is shown at l and such ring may be flanged as indicated at 6. The ring l is provided with the conical races 2 and 3 and an aperture 26 for the introduction of a lubricant.

At the interior of the exterior ring 9 are located two separate inner rings '5 and 8 having respectively theconical raceways and ill spaced from the races 2 and 3 and provided with the roller abutment ribs ii and 52. At the inner ends of the rings 'J and 8 which are the narrow ends of a the rings, grooves are provided for wire retainers M which will prevent the disassembly of the cage and roller assembly.

Located between the races in the outer and inner rings are two series of conical rollers l and 5. The series of rollers differ by one unit so that the number of rollers in each series are prime with respect to one another thereby avoiding resonance vibrations.

The set of rollers comprising the greater num-- her is located on the side on which thrust load is predominant i. e. on side of flange 6 in bearing represented.

Each roller is bored through the ho e registering exactly opposite apertures of identical diameter in roller retaining cages l3 and M. A groove i5 is machined in the bore of each roller and a plurality of radially extending apertures it connect said groove to the face of the roller in contact with the race ribs H and i2 which ensures improved lubrication of this point the oil flowing through the roller being part ally collected by the recess and forced through the radial holes by reason of the centrifugal force enerated by the high speed of rotation of the roller.

Two cages l3 and I4 are shown in detail in Figs. 2, 3 and 4. These cages can be made either of impregnated fabric or of light alloy, the former type being represented in Figs. 1, 2, 3, 4. When light alloys are used, holes 23, for the setting of rivets and plates l'l, l8, l9'and 20 (Fig. 1) which ensure rigidity, may be dispensed with. The mounted in said recesses in said other annular cages have formed therein spaced recesses 22 for casings in cooperative relationship with the other the positioning of the rollers. of said pairs of correlated surfaces and engaging The cages l3 and I 4 retain and space the rollthe other of said second mentioned outer flanges, ers and also prevent oil introduced into the bear- 5 said recesses in each of said rollers comprising a ing through the hole 24 from escaping by cenlongitudinal bore therethrough, an annular a temperature rise. end of said roller, whereby the lubricant may be Cages l3 and H are exactly centered on races projected under pressure through and outwardly 9 and I0 and on ribs l I and i2. No oil can thereof said rollers under the effect of centrifugal fore escape from center of bearing along races force when said roller-bearing is in operation, 9 and I0. Clearance between outer diameter of recesses formed through said annular casings to cages l3 and I4 and outer ring races 2 and 3 allow the flow of lubricant therethrough, resilient is only just suflicient to allow a slight escape of retaining means mounted on each of said angular all necessary for lubrication of races. members and engaging the inner ends of each It will be clearly seen that excess of oil which of said annular casings. is liberally introduced into the bearing by hole 3. An improved roller bearing comprising in 24 can only be evacuated through the hollow rollcombination an integral outer annular member ers and corresponding apertures in retaining having two opposite conical bearing surfaces cages l3 and H. formed therein, inner annular mounting means No oil churning can therefore take place and having two conical bearing surfaces formed heat generated by the sliding friction of rollers therein, each of which is disposed in correlated on ribs II and i2 is carried away by the oil passrelationship to one of said first mentioned suring through the rollers. The great quantity of 25 faces, thereby forming therewith two pairs of oil which can be introduced into the bearing correlated surfaces divergingly po i i n with races, out ra nd i dl one of said series comprising an even number Furthermore lubrication requirements of r0l1- d the other o Said e s comprising an Odd ers on their races and llbS can be exactly conn m r f rollers. and means for retaining said comprising an odd number of rollers, and means elated Surfaces a1 1d engflgmg the related One of for retaining said two pluralitles of rollers 1n Second memloned Cute! flanges. a $660M! th respective pairs of urface series of rollers mounted in the recesses in said recesses formed in said casings, a first plurality gaging the inner ends of each of said annular of said casings in cooperative relationship with 5. An improved bearing comprising in comone of said pairs of correlated surfaces and enbination an outer annular member having two gaging the related one of said second mentioned opposite bearing surfaces formed therein, inner outer flanges, a second plurality of rollers annular mounting means having two bearing surfaces formed therein, each of which is disposed in correlated relationship to one of said first named surfaces thereby forming therewith two pairs of correlated surfaces divergingly positioned with respect to each other, a, first series of anti-friction means mounted in One of said pairs of correlated surfaces, a second series of anti-friction means mounted in the other of said pairs of correlated surfaces, one of said series comprising an even number andthe other of said series comprising an odd number of anti-friction means and means for retaining said two series of anti-friction means within their respective pairs ofbearing surfaces.

6. An improved roller-bearing adapted for high speed machine tool spindles comprising in combination an integral outer annular member having two opposite conical bearing surfaces formed therein, two inner annular members, each having a conical surface formed therein in correlated relationship to each of said first mentioned surfaces thereby forming therewith two diverging pairs of correlated surfaces, a radially outwardly extending flange formed at the longitudinally outer end of each of said inner annular members, a plurality of axially hollow rollers mounted in each of said pairs of correlated surfaces and engaging said flanges, retaining and spacing means for said rollers within their respective bearing surfaces occupying the space between the conical bearing surfaces of inner and outer annular members and having apertures in correlated relationship with the axial bore of said hollow rollers, whereby said apertures in said retaining means constitute the main escape for oil introduced in the bearing, and thus oil must flow through said rollers ensuring the cooling of said rollers.

LOUIS GAIVIET.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Wooler Sept. 19, 1933 Number 

